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    Question

    Triangle ABC has AB = 10, AC = 8, angle A = 60°. Find

    BC.
    A 2√17 Correct Answer Incorrect Answer
    B 2√21 Correct Answer Incorrect Answer
    C 3√23 Correct Answer Incorrect Answer
    D 2√19 Correct Answer Incorrect Answer

    Solution

    ATQ, BC² = 10² + 8² – 2×10×8×cos60 = 100 + 64 – 80 = 84 BC = sqrt(84) = 2√21

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